﻿// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System.Collections.Generic;
using System.Windows.Media;

using Nova.CodeDOM;

namespace Nova.UI
{
    /// <summary>
    /// The view model for a <see cref="CodeDOM.ConstraintClause"/>.
    /// </summary>
    public class ConstraintClauseVM : CodeObjectVM
    {
        #region /* STATICS */

        internal static void AddViewModelMapping()
        {
            CreateViewModel.Add(typeof(ConstraintClause),
                delegate(CodeObject codeObject, bool isDescription, Dictionary<CodeObject, CodeObjectVM> dictionary) { return new ConstraintClauseVM((ConstraintClause)codeObject, dictionary); });
        }

        #endregion

        #region /* FIELDS */

        protected SymbolicRefVM _typeParameterVM;
        protected ChildListVM<TypeParameterConstraintVM> _constraintVMs;

        #endregion

        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create a view model instance for the specified <see cref="CodeDOM.ConstraintClause"/>.
        /// </summary>
        public ConstraintClauseVM(ConstraintClause constraintClause, Dictionary<CodeObject, CodeObjectVM> dictionary)
            : base(constraintClause, dictionary)
        {
            _typeParameterVM = (SymbolicRefVM)CreateVM(constraintClause.TypeParameter, false, dictionary);
            _constraintVMs = CreateListVM<TypeParameterConstraint, TypeParameterConstraintVM>(constraintClause.Constraints, dictionary);
        }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The underlying <see cref="CodeDOM.ConstraintClause"/> model.
        /// </summary>
        public ConstraintClause ConstraintClause
        {
            get { return (ConstraintClause)CodeObject; }
        }

        /// <summary>
        /// The <see cref="TypeParameterVM"/> being constrained.
        /// </summary>
        public SymbolicRefVM TypeParameter
        {
            get { return _typeParameterVM; }
        }

        /// <summary>
        /// The list of <see cref="TypeParameterConstraintVM"/>s.
        /// </summary>
        public ChildListVM<TypeParameterConstraintVM> Constraints
        {
            get { return _constraintVMs; }
        }

        #endregion

        #region /* METHODS */

        #endregion

        #region /* RENDERING */

        public override Brush BorderBrush
        {
            get { return ExpressionVM.StaticBorderBrush; }
        }

        public override Brush BackgroundBrush
        {
            get { return ExpressionVM.StaticBackgroundBrush; }
        }

        public override void Render(CodeRenderer renderer, RenderFlags flags)
        {
            int newLines = ConstraintClause.NewLines;
            if (newLines > 0)
            {
                if (!flags.HasFlag(RenderFlags.SuppressNewLine))
                    renderer.NewLines(newLines, ParentVM);
            }
            else if (flags.HasFlag(RenderFlags.PrefixSpace))
                renderer.RenderText(" ", PUNC_BRUSH, ParentVM);
            flags &= ~RenderFlags.SuppressNewLine;

            bool increaseIndent = flags.HasFlag(RenderFlags.IncreaseIndent);
            if (!flags.HasFlag(RenderFlags.NoBorder))
            {
                CreateBorder(renderer, flags);
                increaseIndent = true;  // Always increase the indent level for wrapped lines inside a border
            }

            RenderFlags passFlags = (flags & RenderFlags.PassMask);
            RenderBefore(renderer, passFlags | RenderFlags.IsPrefix);

            // Increase the indent level for any newlines that occur within the statement if the flag is set
            if (increaseIndent)
                renderer.IndentOnNewLineBegin(this);

            renderer.RenderText(ConstraintClause.ParseToken, KEYWORD_BRUSH, this);
            RenderFlags noDescFlags = passFlags & ~(RenderFlags.Description | RenderFlags.ShowParentTypes);
            if (_typeParameterVM != null)
                _typeParameterVM.Render(renderer, noDescFlags | RenderFlags.IsPrefix | RenderFlags.PrefixSpace);
            renderer.RenderText(ConstraintClause.ParseTokenSeparator + " ", PUNC_BRUSH, this);
            renderer.RenderList(_constraintVMs, noDescFlags, this);
            RenderEOLComments(renderer, flags);

            if (increaseIndent)
                renderer.IndentOnNewLineEnd(this);

            RenderAfter(renderer, passFlags | (flags & RenderFlags.NoPostAnnotations));

            // If we have a border, return to the previous one
            if (!flags.HasFlag(RenderFlags.NoBorder))
                renderer.ReturnToBorderParent(this);
        }

        public static void RenderConstraints(CodeRenderer renderer, ChildListVM<ConstraintClauseVM> constraintVMs, RenderFlags flags)
        {
            if (constraintVMs != null && constraintVMs.Count > 0)
                renderer.RenderList(constraintVMs, flags | RenderFlags.NoItemSeparators | (constraintVMs[0].IsFirstOnLine ? 0 : RenderFlags.PrefixSpace), constraintVMs.Parent);
        }

        public override void UnRender()
        {
            if (_typeParameterVM != null)
                _typeParameterVM.UnRender();
            ChildListHelpers.UnRender(_constraintVMs);
            base.UnRender();
        }

        #endregion
    }
}
